👉 Rim fluid, also known as mucin or serous fluid, is a clear, viscous substance that lines the inner surface of the nasal cavity and the walls of the nasopharynx. It plays a crucial role in maintaining the health and function of these areas by providing lubrication, which aids in the smooth movement of mucus and cilia, and by trapping particles such as dust, microbes, and allergens. This fluid is produced by goblet cells and submucosal glands within the mucosa and helps to keep the nasal passages moist, preventing them from drying out and becoming inflamed or obstructed.
